Color Optical/X-ray
Composite
This image shows the Chandra X-ray data overlaid on
optical data from the same region. Note that wide-field
Chandra images make the point sources around the edges
look big and the ones in the middle look small. This is
an artifact of the telescope. The optical does not have
such distortions.(Credit: X-ray: NASA/CXC/Penn
State/L.Townsley et al. Optical: T.A.Rector, B.Wolpa,
M.Hanna, KPNO 0.9-m Mosaic, NOAO/AURA/NSF)

Optical Image
This false color (hydrogen = red, oxygen = green,
sulfur = blue) optical image of the Rosette Nebula
shows a prominent star formation region, glowing due to
ultraviolet light from the young, hot, blue stars whose
winds also cleared the central hole. It is very large
on the sky, covering more than six times the area of
the full moon.(Credit: Optical: T.A.Rector,
B.Wolpa, M.Hanna, KPNO 0.9-m Mosaic, NOAO/AURA/NSF
)